Struct ScannerError 

pub struct ScannerError {
    pub failure: ScannerFailure,
    pub message: String,
}

What: One scanner failure: its cause and a complete explanation. String owns the text (sibling &str would borrow a temporary). Why: The explanation of a load failure is the scanner’s own redacted message, which names a path or an opaque rule index and never rule text.

In TS you’d write (pseudocode):

class ScannerError extends Error { failure: ScannerFailure; message: string }

Fields

failure: ScannerFailure

Closed cause callers branch on.

message: String

Complete diagnostic.

Trait Implementations

impl Clone for ScannerError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ScannerError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ScannerError

What: impl std::fmt::Display for ScannerError supplies Rust’s “print me” interface. Why: The executable writes the message with ordinary formatting, not field access.

In TS you’d write (pseudocode):

toString(): string { return this.message; }

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

&self borrows this error read-only; &mut lends the formatter for writing.

impl Eq for ScannerError

impl Error for ScannerError

An empty impl marks the type as a standard error value.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for ScannerError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScannerError